[lxml-dev] gzip compression detection

Hi list, In the documentation it says that lxml can automatically detect and process gzipped xml (.gz). Which I'm sure (but haven't tried) works when it's parsing from a file with the appropriate extension, but is this possible from an in memory string? My situation: I have a berkeley db based storage system which maintains gzipped xml. I currently just use python's gzip module to uncompress before sending to lxml, but if I could skip this step I'm sure there'd be good performance benefits. Have looked for how to do this but no luck. Perhaps a parser option? Thanks! Rob